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TPS63002大面积发烫

Other Parts Discussed in Thread: TPS63002

你好:

       我公司在一款产品上使用TPS63002,出现大面积发烫(温度烫手),约有百分之40,发烫的芯片取下,发现4引脚和9引脚短路,请问是否是芯片烧了?是什么原因造成的?谢谢!原理图跟数据手册上一样!